ES2256010T3 - CARTON AND TROQUEL TRAY. - Google Patents

Abstract

A tray and a blank (10) for forming the tray for holding foodstuff or the like which tray is formed from paperboard or like foldable sheet material and can be erected from a flat collapsed condition into a position of use, the tray comprising a plurality of tray walls including a base wall (18), opposed side and end walls (16, 20; 58, 70), wherein there further comprises a gusset panel structure (74, 78) spanning each side wall (16, 20) and either end wall (58, 70) to prevent egress of fluid from the base wall (18) at each corner of the tray, and wherein the gusset structure (74, 78) and the end walls (58, 70) are automatically erected in response to folding of the opposed side walls (16, 20) towards each other.

Description

Cardboard and die tray.

Background of the invention

The present invention is sent to a container of cardboard or tray intended to accommodate food, for example fish or meat, and more particularly in a cardboard container formed to from one or from several cardboard dies or from another suitable folding sheet material.

Tray structures formed from cardboard generally lacks resistance when compared to the trays made from plastic, although the trays are made more commonly from polystyrene or other plastic material.

WO 93/15962 discloses the fact of propose a fluid-tight packing tray made to from cardboard, comprising a single base panel surrounded by sidewall and endwall structures and connected thanks to a fencing arrangement in order to maintain a impermeability in food and prevent liquids that rise by capillarity.

US 5183 201 describes another tray fluid tight. The tray comprises a single base panel which contains side panels and end panels that are connected in an articulated way. The side wall panels have longer than the base panel and are connected to the end panels.

The trays the previous type do not seem lend itself to a mechanized construction and in particular to a Automatic lifting of the end side walls.

Summary of the Invention

The present invention, in its embodiment preferred try to overcome, or at least mitigate the problems precedents

A first aspect of the invention proposes a procedure of forming a tray from a die, the die containing the first side wall panel, a panel base wall interior, a second side wall panel articulated to each other in series, and opposite wall panels of interior end articulated on the base wall panel inside and a simple bag panel that connects each end of each inner end wall panel to its side wall panel neighbor, in which each bag panel is connected so foldable to neighboring side and end panels along the first and second fold lines respectively, the first and second fold lines that converge on the neighboring intersection of the side edges and the end of the panel of base wall, said procedure finishes the construction of the tray fixing the first and second side wall panels in its folded positions, characterized by the stage consisting of pre-fold each bag panel following the respective first and second fold lines and to fold the first and second side wall panels towards each other putting them out of alignment with the base wall panel inside, thereby causing the fold of each bag panel such way that the inner end wall panels are folded towards each other, being the angle between the first and second fold lines less than 45 degrees.

Preferably, each bag panel is automatically folded inwards by its wall panel neighbor side to be placed in surface contact relationship  with the neighboring side wall panel following said fold each other's side wall panels out of alignment with the inner base wall panel.

\hbox{con el panel de pared de base 
interior.}

As a variant, each bag panel is automatically folded into its neighboring end wall panel to be brought into surface contact with the neighboring end wall panel after said fold towards each other of the panels of side wall out of alignment

 \ hbox {with the base wall panel 
inside.} 

As a variant, the die also comprises a first supplementary side wall panel, a second panel of supplementary side wall, an outer base wall panel and opposite outer end wall panels, the first and second supplementary side wall panels that are articulated to the first and second side wall panels respective, the opposite outer panels of end walls being articulated on the outer base wall panel with the in order to form a composite structure when the die is assembled to form a tray.

Preferably, the first wall panels lateral form a first composite lateral wall, the panels interior and exterior base wall form a base wall composed, the second side wall panels form the second composite side wall, and each inner end wall panel and its outer end wall outer panel form a wall of compound end.

Preferably, the first wall panels side are separated by the first spacing panel and the second side wall panels are separated by the second spacing panel

According to an optional feature of this aspect of the present invention, the die further comprises a joist type support structure formed from each of the inner end wall panels connected so folding following a third fold line in the margin side of the inner base wall panels and their panel outer wall end neighbor foldably connected following a fourth fold line to the outer wall panel of base, the third and fourth fold lines are out of date such that, after assembly, each interior wall panel end extends up to get to rely on the outer outer panel of end wall to thereby define the joist.

According to an optional feature of this aspect of the invention, each bag panel interconnects so Fold your inner end wall end panel and your panel neighboring side wall.

Preferably, each bag panel is shaped triangular, said neighbor end wall panel containing a beveled edge to which the triangular wall panel is connected from folding way.

As a variant, the angle between the first line fold of each bag panel and the neighboring side edge of the base wall is greater than 90 degrees, and the angle between the second fold line of each bag panel and the neighboring end edge of the base wall is greater than 90 degrees.

According to an optional feature of this aspect of the present invention, the bag panel protrudes towards the exterior from the neighbor interior end wall panel when The die is assembled to form the tray.

Preferably, each bag panel is covered by its neighbor outer end wall panel and by its neighbor outer side wall panel when the die is Assemble to form the tray.

According to an optional feature of this aspect of the invention, interior wall panels are provided for a second die.

As a variant, the die comprises a first side wall panel, an interior base wall panel, a second side wall panel articulated to each other in series, and articulated opposite interior end wall panels on the inner base wall panel and further comprising a simple bag panel that connects each end of each panel inner end wall to its neighbor side wall panel, each bag panel being foldably connected to the panels lateral and extreme neighbors along first and second fold lines respectively, the first and second lines of fold converging on the neighboring intersection of the edges side and end of the base wall panel, characterized because the angle between the first and second fold lines is less than 45 degrees and in which each bag panel is pre-folded following the first and second lines respective folding, and the first and second wall panels side are bent out of alignment with the panel interior base wall, thereby causing the fold of each panel of bag so that the end wall panels interiors bend towards each other and the first and second Side wall panels are fixed in their folded positions for Finish the construction of the tray.

Preferably, the die further comprises a first supplementary side wall panel, a second panel of supplementary side wall, an exterior base wall panel and opposite outer end wall panels, the first and second  supplementary side wall panels are connected so articulated to the first and second side wall panels respective, the opposite outer end wall panels are articulated connected on the wall panel of outer base in order to form a composite structure when The die is assembled to form a tray.

Preferably, the first wall panels lateral form a first composite lateral wall, the panels of interior and exterior base wall form a base wall composite, the second side wall panels form a second composite side wall, and each inner end wall panel and its neighbor outer end wall panel form a wall of compound end.

Preferably, the first wall panels lateral are separated by a first intermediate panel, and the second side wall panels are separated by a second intermediate panel

According to an optional feature of this aspect of the present invention, the die further comprises a joist type support structure formed from each of the inner end wall panels connected so folding following a third fold line in the margin side of the interior base wall panels and their panel neighbor outer end wall foldably connected following a fourth fold line on the base wall panel outside, the third and fourth fold lines are out of date in such a way that after assembly, each wall panel of inner end extends upward to reach support against the neighbor outer end wall panel to define with It is the joist.

According to an optional feature of this aspect of the invention, each bag panel interconnects so Fold your inner end wall end panel and your panel neighboring side wall.

Preferably, each bag panel is shaped triangular, said neighbor end wall panel containing a beveled edge to which the triangular wall panel is connected from folding way.

As a variant, the angle between the first line fold of each bag panel and the neighboring side edge of the base wall is greater than 90 degrees, and the angle between the second fold line of each bag panel and the neighboring end edge of the base wall is greater than 90 degrees.

According to an optional feature of this aspect of the present invention, the bag panel protrudes towards the exterior from the neighbor interior end wall panel when The die is assembled to form the tray.

Preferably, each bag panel is covered by its neighbor outer end wall panel and by its neighbor outer side wall panel when the die is mounted To form the tray.

According to an optional feature of said aspect of the invention, the interior wall panels are provided by a second die.

Embodiments that serve as an example of the invention will now be described, only as example, with reference to the accompanying drawings, in the which:

Figure 1 is a plan view of a die intended to make a cardboard container according to a form of preferred embodiment of the invention;

Figure 2 is a bottom view of a container of cardboard partially formed from the die represented in figure 1;

Figure 3 is a plan view from above of the top of a partially formed cardboard container to starting from the die shown in figure 1;

Figures 4 and 5 are perspective views of the cardboard container represented during the fold;

Figure 6 is a plan view of a die intended to form a cardboard container according to a second form of preferred embodiment of the invention;

Figures 7 and 8 are perspective views of the cardboard container formed from the die of the figure 6;

Figures 9A and 9B are plan views of a two part die intended to form a cardboard container according to a third embodiment of the invention;

Figures 10A, 10B and 10C represent the realization of the cardboard container from the dies of the Figures 9A and 9B; Y

Figures 11 and 12 are views in perspective of the cardboard container formed from the die represented in figures 9A and 9B.

Detailed description of the preferred forms of realization

Referring first to the first form of embodiment depicted in figure 1, a die is shown 10 intended to form a tray or a cardboard container being able to be placed on a plane consisting of one or more dies of cardboard or a similar folding sheet material. In this form of embodiment, the die 10 comprises a first wall flap of outer base 12, outer and inner side wall panels 14, 16, an inner base wall panel 18, a second pair of panels of inner and outer side wall 20, 22, and a wall panel of outer base 24 connected to each other in series so articulated, following the fold lines respectively 26, 28, 30, 32, 34 and 36. In other embodiments, dies separated can be used to form the structure containing two layers or even a structure containing only one layer, it is desirable incorporating the invention.

We also have a wall panel 38 of outer end, articulated connected to an edge of end of the outer base wall panel 24 that follows the fold line 40 and a second end wall panel 42 exterior connected in an articulated manner to the opposite end edge of the outer base wall panel 24, following the line of fold 44. Preferably, each panel 38, 42 of the wall of outer end may further comprise a support flap 39, 43 intended to support the stretch film located along of the outer edges of the outer end flaps 34, 36, respectively according to the fold lines 41 and 45, as describe further.

A suitable fixing means is placed to connect the end wall and side wall panels. This embodiment comprises a pair of fixing flaps 46, 48 placed opposite each other, extending from opposite ends of the side wall panel 22 and which are connected thereto following collinear extensions of the fold lines respectively 40 and 44. The fixing flaps 46, 48 are neighbors of the end panels 38, 42 and are separated from them by cutting lines. Similarly, a second pair of fixing flaps 50, 54 is foldably connected to opposite ends of the outer side wall panel 14 following fold lines 52, 56, respectively.

In this embodiment a first liquid retention structure 57, shown in the figure 4, is provided by an end flap 58 connected in a manner folding to the base wall panel 18 that follows the fold line 60. Considering again Figure 1, the first structure of Liquid retention is provided by an end flap 58 which is connected to the inner side wall panels 16 and 20 opposites respectively, by an angle structure. In this embodiment, angle structures are provided by bag panels 62 and 66. Bag panel 62 is connected in folding way to a side edge of the end flap 58 following an extension of the fold line 30 (line of fold 63) and connects foldably to the wall panel inner side 16 following the fold line 64. Optionally, the fold line 64 is configured to converge bound for the intersection of fold lines 30 and 60, although the bag panel 62 is substantially in shape triangular.

Similarly, bag panel 66 is foldably connected to the opposite side edge of the flap of end 58 following an extension of the fold line 32 (fold line 67). The bag panel 66 is connected to the panel of inner side wall 20 following the fold line 68. The fold line 68 can converge towards the intersection of the fold lines 60 and 32, although the bag panel 66 preferably it has a triangular shape.

In certain embodiments the lines of fold connecting end flap 58 to bag panels 62, 66 are outdated relative to the fold lines 30, 32 which connect the side panels and the base panel.

Preferably, there is also a second liquid retention structure 71 which, in this form of embodiment, is die cut from the opposite end edge of the inner base panel 18. The second structure is similar to the first structure, and is provided with an end flap 70 foldably connected to the base wall panel 18 following the fold line 72. The end flap 70 is also connected to opposite inner wall panels 16, 20 respectively by the bag panels 74 and 78. The bag panel 74 is foldably connected to a side edge of the flap of end 70 following a fold line 31, which is a extension of the fold line 30. The bag panel 74 is foldably connected to the inner side wall panel 16 following the fold line 76. In this embodiment, the fold line 76 is configured to converge towards the intersection of the fold lines 31 and 72 such that the Bag panel 74 has a substantially triangular shape. So similarly, the bag panel 78 is foldably connected to the opposite side edge of end flap 70 following a line  of fold 33 which is an extension of the fold line 32. The bag panel 78 is connected to the inner side wall panel 20 following the fold line 80. The fold line 80 converges towards the intersection of fold lines 72 and 33, although the bag panel 78 preferably has a shape triangular.

Now considering the construction of the panel base 18 interior, we will see that the side wall panels interiors 16, 20 have a length greater than that of the panel inner base 18, although the opposite ends of the panels of side wall interiors go outward beyond the End edges of the inner base wall panel. Each of the outgoing end parts of each of the Interior side wall panels, contains a beveled edge to the which is foldably connected to the neighboring bag panel. This configuration favors the automatic folding that must be carried out during the assembly of the tray on which a fluid retention structure to prevent leakage of fluids out of the tray.

The angle between the fold lines that define The bags is less than 45 degrees.

Thus, bag panels 62, 66 and 76, 78 they provide a fluid retention structure that can prevent the exit of fluids contained in the tray and allow the end panels be deployed automatically, in this this causes automatic lifting in reaction to lifting (or folding) of the neighboring side wall panel. Preferably, the angle between the fold lines that define Each bag panel is less than 45º, although it is expected that in certain embodiments the angle may be higher.

The tray assembly of the first form of embodiment is described with reference to figures 2 and 5. It is provided that the flattening of the cardboard container, the die and the final assembly as well as the load of the cardboard container of the present invention, can be realized thanks to a series of gluing and folding operations that follow, on machines that they work more or less online, but without the need to turn or flip the cardboard container to finish its assembly. The process folding is not limited to that described further and may be modified according to the particular manufacturing requirements.

The panels 22, 24, outer side and base, they are folded first inwards following the line of fold 34, and brought into contact by overlapping with the panel inner side and respective base wall panel 20, 18. The base panel exterior wall 24 can be fixed on the panel base wall interior 18 with the aid of glue, or other means of known fixation in the bouquet. Normally one or several lines of glue can (can) be applied (s) on the underside of the inner base wall panel, to provide a surface adhesive At the same time, or after that, the wall panel outer side 14 and outer base flap 12 are retracted inward following the fold line 28 and in relation to face-to-face contact with the inner side wall panel 16 and the inner base panel 18 respectively. Outer flap of base 12 is fixed on the inner wall panel of base 18 with glue aid or other suitable means. Optionally, the flap outer base 12 is in alignment with the outer panel of base 24 to which, in this embodiment, they provide assistance due to the fact that parts in projection are provided, and parts in complementary retraction represented in figure 2. Thus the Cardboard container is put in flat state, as depicted in the Figures 2 and 3, for delivery to the user, with a view to being put in the form of a tray.

Preferably, the wall flaps 58, 70 of end and bag panels 62, 66; 76, 78 of the inner panel of base wall 18 are not fixed on the outer base panel 24 or on the respective outer end wall panels 38, 42 and, therefore, can be displaced in relation to these panels. Bag panels, or angle structures, are pre folded to facilitate the final fold of the side panels and of the end panels.

To mount the cardboard container, the sides and the ends are formed by folding the side wall panels 14, 16; 20, 22 inwardly following, respectively, the lines of fold 30 and 32, as depicted in figure 4. The action of fold "X" causes the fold of the bag panels 62, 66 and 74, 78 in the upward and inward direction and in relation to Face-to-face contact with side wall panels respective interiors 16, 20 such that the end flaps inside 58, 70 fold automatically inwards and upwards until it is in the assembled state, as represented in figure 4. This advantageously reduces the time of cardboard container assembly which is an important factor in the automated packaging In this embodiment, the flaps end wall interiors 58, 70 are angled sharp relative to the base wall panel 18 in order to define a part of the support structure to which we we will refer later.

After that, the outer end wall panels 38, 42 are folded inside in the Y direction following the fold lines 40, 44 until they reach the stop against respectively the inner end wall flaps 58, 70 and are fixed on its place fixing on them fixing flaps 46, 50 and 48, 54 to keep the tray in the assembled state, as shown in figure 5.

Now considering the second form of embodiment depicted in figures 6, 7 and 8, we show a die 110 intended to form a tray, represented in the Figure 8, said die is made of cardboard or by a similar folding sheet material. The die is noticeably the same as in the first embodiment and similar parts are designated by the same numerical reference, with prefix 1. Due to it only the differences between both embodiments They will be described in detail.

We will observe that the side wall panels interior and exterior 114 and 116 are separated by a panel intermediate 115 that is connected to these in an articulated manner according to fold lines 128 and 129 respectively. similar, a second pair of inner side wall panels and exterior 120, 122 is also separated by an intermediate panel 121 and connected in an articulated way to it following the lines of fold 134 and 135. During use these panels supply a structure of the joist type along each side wall, which improves the rigidity of the tray, as depicted in the Figures 7 and 8.

Another difference concerns the fold lines 164, 168, 176 and 180 connecting bag panels 162, 166, 174, 178 to their respective side wall panels 116, 120. We will observe that these fold lines are always preferably divergent, but that its orientation in relation to the lines fold neighbors 130 and 132 have been modified. This structure advantageously allows automatic deployment of the panels end wall 158 and 170 interiors and bag panels 162, 166, 174 and 178, although bag panels 162, 166, 174 and 178 are folded to the gaps formed by the structures of the joist type of the side walls; It results in the respective end panels 158, 170 may be arranged in face-to-face contact with its neighboring panels of bag 164, 168; 174, 178 to supply an angle structure thanks to which the end panels and side panels interiors reach the retention stop to provide corners paired as shown in figure 8.

The third embodiment of the invention It is represented with reference to Figures 9A, 9B, 10A, 10B, 10C and 11 and 12. The third embodiment is substantially the same that the first and second embodiments and, therefore, the Similar pieces are designated by the same numerical references, but with prefix "2". That is why only differences in relation to the first and second forms of realization will be described in more detail.

We will observe according to figures 9A and 9B that the third embodiment differs from the second form of embodiment in which it is made from a die in Two parts. This allows, advantageously, that the panels that form the inner structure of the tray are coated with agents impervious to water and / or grease and suitable to be suitable for Receive food That's why the panels that make up the tray outside do not need to go through the same process, which means cost price savings.

However, the realization of the third form of realization differs from that of the first and second forms of embodiment in which the inner tray die is applied on outer tray die, inner and outer panels base wall 218, 224 are arranged according to provisions in face-to-face contact alignment and are fixed to each other by means of G tail or other suitable known means. Preferably the inner wall panels 216 and 220 are fixed on the respective inner side wall panels 219 and 217 of the outer die, as shown in the figure 10B The other panels are constructed in the same way as in the embodiments described above, in order to have a flat tray as shown in figure 10C, which will be served to the user. With the purpose of build the tray, the side walls are built by the fold in the "X" direction, which causes the deployment automatic interior 258 and 270 end wall panels, similar to the one described above and the outer panels end 238, 242 are folded and fixed on the panels of Next adjacent side wall 222; 214 to provide with this a tray as shown in figure 12.

Preferably, a support structure is provided at each end, defined by interior panels and outer ends, and by the outer base wall panel that form a joist in order to increase the rigidity of the tray. It is contemplated that the support structure can be incorporated to the invention without retention structures of liquids, without leaving the scope of the invention. Besides, the angle structure is arranged internally relative to the outer panels of the tray (that is between the trays inside and outside) in order to provide a tray aesthetically pleasing and allow to easily see the promotional items

It is contemplated that the support structure can be mounted automatically using other configurations than those described above, without leaving the scope of the invention. For example the support structure, or each support structure, it can be provided by the side wall panels, or the end flap could be connected to the outer panels of end, to favor the automatic assembly of the panels outside

In certain embodiments, the flaps of end 58, 70 are prevented from being bent beyond a point predetermined by the first fold flaps 39, 43 of such so that the fold lines 41, 45 serve as stops of limitation.

After that, food is loaded into the tray from the top and an elastic film can be applied on the tray to waterproof the packaging flaps 39, 43 are folded before the application of the film, or simultaneously, to have the film away from the product and to provide a surface intended to receive the movie.

Thus, figures 5, 8 and 12 represent a tray intended to contain food or similar items, said tray is made from cardboard or from a material in similar folding blade and can be mounted from the flat state represented in figures 2 and 10C, until it is put into position of use. The tray comprises a plurality of panels that they comprise a base wall panel, opposite side panels and opposite end panels, the tray further comprising a bag panel structure that connects the side panels and the end panels in order to prevent fluids from flowing from the base wall panel at each corner of the tray, the bag structure and end panels being automatically  mounted in reaction to the folding of the side wall panels opposite in direction of each other.

The resulting support structure 90, 190, 290, represented on figures 5, 8 and 12, created by the flap inner end wall, outer end wall panel and the outer base wall panel provides a support supplementary with a view to improving the stiffness of the packaging of paperboard.

Advantageously the embodiment of two layers described above provides a structure that is reinforced with a view to containing food. The use of a cardboard type material provides an alternative "friend of environment "to trays made from materials plastic, and the tray can contain printed texts for purposes advertising

We will understand that as they are used here address references like, that "top", "base", "end" and "side" do not limit the panels respective to said orientation, but only serve to distinguish these panels from each other. Any reference to a articulated connection should not be understood as necessarily referring to a single fold line: in fact, it is planned that an articulated connection can be formed by one or more of the following lines, a marked line, a single line, or a fold line, without leaving the scope of the invention.

The present invention and its preferred embodiment are referred to an article holder that is configured with a view to providing satisfactory rigidity to contain products such as meat or fish in a safe manner but with a certain degree of flexibility. The shape of the die minimizes the amount of cardboard material needed to make the cardboard container. The products can be applied on the support, either manually or with the help of an automatic machine. It is contemplated that the invention can be applied to various types of cartons or various trays and is not limited to the type of flat tubular fabric, for example, the flat tubular structure could be replaced by a structure containing longer side panels and end panels in order to receive cuts of meat of larger dimension. In addition, the support structure (s) can (n)
be made (s) from the side wall panels of the cardboard container without leaving the scope of the invention.

Claims (25)

1. Procedure for forming a tray from a die (10), the die comprising a first side wall panel (16), an inner base wall panel (18), a second side wall panel (20) articulated to each other in series, and opposite inner end wall panels (58, 70) articulated on the inner base wall panel (18) and a simple bag panel (62, 66, 74, 78) that connect each end of each inner end wall panel (58, 70) to its neighboring side wall panel (16, 20) in which each bag panel (62, 66, 74, 78) is foldably connected to neighboring side and end panels (16, 58) (20, 58) (16, 70) (20, 70) along first and second fold lines (64, 63) (68, 67) (76, 31) (80, 33) respectively, the first and second fold lines converging on the neighboring intersection of the side and end edges of the base wall panel (18), said procedure terminates the c construction of the tray by fixing the first and second side wall panels (16, 20) in their folded positions, characterized by the stage consisting of pre-folding each bag panel (62, 66, 74, 78) following the first and second respective fold lines (64, 63) (68, 67) (76, 31) (80, 33) and in folding the first and second side wall panels (16, 20) towards each other by placing them out of alignment with the inner base wall panel (18), thereby causing the fold of each bag panel (62, 66, 74, 78) such that the inner end wall panels (58, 70) are bent one towards the other, the angle between the first and second fold lines being less than 45 °. 2. Method according to claim 1, in the which each bag panel (62, 66, 74, 78) is automatically folded into its neighbor side wall panel (16, 20) to be placed in surface contact relationship with the panel neighboring side wall (16, 20) after said fold of the side wall panels (16, 20) out of alignment with the interior base wall panel (18). 3. Method according to claim 1, in the which each bag panel (162, 166, 174, 178) is automatically folded into its neighbor end wall panel (158, 170) to be placed in surface contact relationship with the neighbor end wall panel (158, 170) after said fold the side wall panels (116, 120) out of the alignment with the inner base side wall panel (18) 4. Method according to claim 1, in the which the die (10) further comprises a first wall panel Supplementary side (14), a second side wall panel supplementary (22), an exterior base wall panel (24) and opposite outer end wall panels (38, 42), the first and second supplementary side wall panels (14, 22) are articulated to the first and second respective side wall panels (16, 20), opposite outer end wall panels (38, 42) are articulated on the outer base wall panel (24) in order to form a composite structure when the die is assembled to form the tray. 5. Method according to claim 4, in the which the first side wall panels (14, 16) form a First composite side wall, base wall panels interior and exterior (18, 24) form a composite base wall, the second side wall panels (20, 22) form a second wall composite side, and each inner end wall panel (58, 70) and its neighboring outer end wall panel (38, 42) form a compound end wall. 6. Method according to claim 5, in the which the first side wall panels (114, 116) are separated by a first intermediate panel (115), and the second panels of side wall (120, 122) are separated by a second panel intermediate (121). 7. Procedure according to any one of the claims 4 to 6, wherein the die (10) further comprises a support structure of beam type formed from each one of the inner end wall panels (158, 170) foldably connected following a third fold line (160, 172) on the side margin of the base wall panels interiors (118) and its neighboring interior end wall panel (138, 142) foldably connected following a fourth line folding (140, 144) to the outer base wall panel (124), the third and fourth fold lines being offset in such a way that, after assembly, each inner end wall panel (158, 170) extends up to reach the top against the neighbor outer end wall panel (139, 143) for define with this fact the joist. 8. Procedure according to any one of the claims 5 to 7, wherein each bag panel (162, 166, 174, 178) interconnects folding wall panel neighboring inner end (158, 170) and its side wall panel neighbor (116, 120). 9. Method according to claim 8, in the which each bag panel (162, 166, 174, 178) is triangular in shape and in which said neighbor end wall panel (158, 170) it has a beveled edge to which the triangular bag panel is Folding connected. 10. Method according to claim 1, in which the angle between the first fold line (164, 168, 176, 180) of each bag panel (162, 166, 174, 178) and the side edge neighbor of the base wall (118) is greater than 90 degrees, and in the which angle between the second fold line (131, 135, 133, 137) of each bag panel (162, 166, 174, 178) and the edge of neighboring end of the base wall (118) is greater than 90 degrees. 11. Procedure according to any one of the claims 8 to 10, wherein the bag panel (162, 166, 174, 178) makes outward projection from the wall panel of neighboring inner end (158, 170) when the die is assembled To form the tray. 12. Method according to claim 11, in which each bag panel (162, 166, 174, 178) is covered by its neighbor outer end wall panel (138, 142) and its panel of outer side wall neighbor (114, 122) when the die is assembled to form the tray. 13. Procedure according to any one of the claims 1 to 12, wherein the interior wall panels (216, 218, 220, 258, 220) are provided for a second die 14. Die (10) suitable for forming a tray by the method of claim 1, said die comprises a first side wall panel (16), an inner base wall panel (18), a second side wall panel ( 20) articulated to each other in series and opposite inner end wall panels (58, 70) articulated on the inner base wall panel (18) and further comprising a simple bag panel (62, 66, 74, 78) that joins each end of each inner end wall panel (58, 70) to its neighboring side wall panel (16, 20), in which each bag panel (62, 66, 74, 78) is connected foldably to neighboring side and end panels (16, 58) (20, 58) (16, 70) (20, 70) along the first and second fold lines (64, 63) (68, 67) (76, 31) (80, 33) respectively, the first and second fold lines converging on the neighboring intersection of the side and end edges of the wall panel of b ase (18) characterized in that the angle between the first and second fold lines is less than 45 degrees and that each bag panel (62, 66, 74, 78) is pre-folded following the first and second respective fold lines ( 64, 63) (68, 67) (76, 31) (80, 33), and the first and second side wall panels (16, 20) fold out of alignment with the inner base wall panel (18 ), thereby causing the folding of each bag panel (62, 66, 74, 78) such that the inner end wall panels (58, 70) are bent towards each other and the first and second panels of side wall (16, 20) and are fixed in their folded positions to finish the construction of the tray. 15. Die according to claim 14, in the which the die (10) further comprises a first wall panel Supplementary side (14), a second side wall panel supplementary (22), an exterior base wall panel (24) and opposite outer end wall panels (38, 42), the first and second supplementary side wall panels (14, 22) are connected in an articulated manner to the first and second panels of respective side wall (16, 20), end wall panels opposite exteriors (38, 42) are connected in an articulated manner on the outer base wall panel (24) in order to form a composite structure when the die (10) is assembled to form a tray 16. Die according to claim 15, in the which the first side wall panels (14, 16) form a First composite side wall, base wall panels interior and exterior (18, 24) form a composite base wall, the second side wall panels (20, 22) form a second wall composite side, and each inner end wall panel (58, 70) and its neighboring outer end wall panel (38, 42) form a compound end wall. 17. Die according to claim 16, in the which the first side wall panels (114, 116) are separated by a first intermediate panel (1, 15), and the second side wall panels (120, 122) are separated by a second intermediate panel (121). 18. Die according to any one of the claims 15 to 17, wherein the die (10) comprises also a support structure of beam type formed from each of the inner end wall panels (158, 170) foldably connected following a third fold line (160, 172) on the lateral margin of the base wall panels interiors (118) and its neighboring outer end wall panel (138, 142) foldably connected following a fourth line folding (140, 144) to the outer base wall panel (124), the third and fourth fold lines are offset in such a way that, after assembly, each end wall panel interior (158, 170) extends upwards to reach the neighbor outer end wall panel stop (139, 143) for define with it the joist. 19. Die according to any one of the claims 16 to 18, wherein each bag panel (162, 166, 174, 178) interconnects folding wall panel neighboring inner end (158, 170) and its side wall panel neighbor (116, 120). 20. Die according to claim 19, in the which each bag panel (162, 166, 174, 178) is triangular in shape and in which said neighboring side wall panel (158, 170) behaves a beveled edge to which the triangular bag panel is Folding connected. 21. Die according to claim 14, in the which angle between the first fold line (164, 168, 176, 180) of each bag panel, (162, 166, 174, 178) and the side edge neighbor of the base wall (118) is greater than 90 degrees, and in the which angle between the second fold line (130, 132) of each bag panel (162, 166, 174, 178) and the neighboring end edge of the base wall (118) is greater than 90 degrees.

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22. Die according to any one of the claims 19 to 21, wherein the bag panel (162, 166, 174, 178) makes outward projection from the wall panel of neighboring inner end (158, 170) when the die is assembled to form the tray. 23. Die according to claim 22, in the which each bag panel (162, 166, 174, 178) is covered by its neighbor outer end wall panel (138, 142) and its panel neighboring outer side wall (114, 122) when the die is assembled to form the tray. 24. Die according to any one of the claims 14 to 23, wherein the interior wall panels (216, 218, 220, 258, 220) are provided for a second die 25. Tray constructed from a die according to any one of claims 14 to 24.